Rockwell Automation GMLC Reference Manual - Manual (Page 316)

Publication GMLC-5.2 - November 1999
Position Lock CAM 279
When the absolute position of the master axis passes the specified master
axis reference position and enters the range defined by the master cam
table, PCAM_profile_status for the specified slave axis is set to 1 and
slave axis motion is initiated according to the specified profile. From this
point on, the incremental change in the master axis position alone
determines the corresponding slave axis position from the defined profile
points. This is important for applications where the master axis is a rotary
axis, because the position-lock cam remains unaffected by the unwind
process.
When the master axis moves out of the range defined by the master
position table, PCAM_profile_status = 0, but the cam is not automatically
disabled (PCAM_status = 1).
See Disable PCAM and Stop Motion in this section for more information
on disabling and stopping position-lock cams. See the System Variables in
this manual for more information on the PCAM_status and
PCAM_profile_status variables.
.
Slave Axis Position
Master Axis
Position
PCAM_status
PCAM_profile_status
Master
Reference
Position
Position-Lock
Cam Initiated
0
1
0
1
Profile Stored
in Cam Tables